Revert "apns: Add type default for Sprint."

This mask a real problem on devices on legacy cdma because we didn't
a stubbed apn for devices that don't use apn to connect to data.

this patch fixes it: http://review.cyanogenmod.org/#/c/62148/

this also problem with sprint 3g APN and lte apn numerics is the same
causing the apn stick together. one of those apn will always stick
persistently unless we force a manual disconnect or by selecting an apn
number from the list and that the 3g apn is due to the effect that it has
 no way determining on which apn is used in sprint. they do it by the
numeric, which is why most lte numerics apn is separate from 3g numeric.

We had a large debate on this issue once before, this is the same bug:

http://review.cyanogenmod.org/#/c/51425/

This reverts commit 5de6ec579e2dbe619eac1dac3152e9a863ba26ba.

Change-Id: Ia5c8310af0dce1805ae400d9f78c87c94cdc3cc2
Softbank carrier overlay that fixes Mms User Agent for both Mms.apk & Hangouts

This forces set UA string to Nexus5 for SoftBank MCC:440 MCN:20.
Tested send/receive & confirmed working by yours truly.

Change-Id: I1831c329eb38507a957111052bb5f56350c49361
apns: remove default- and dun-types for Verizon MMS 31x/48x